XR27 Loudspeaker System
Owner’s Manual
XR27
McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549
WARNING - TO REDUCE RISK OF
FIRE OR ELECTRICAL SHOCK, DO
NOT EXPOSE THIS EQUIPMENT TO
RAIN OR MOISTURE.
IMPORTANT SAFETY
INSTRUCTIONS!
PLEASE READ THEM BEFORE
OPERATING THIS EQUIPMENT.
NO USER-SERVICEABLE PARTS
INSIDE. REFER SERVICING TO
QUALIFIED PERSONNEL.
General:
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Warning: To reduce risk of fire or electrical shock,
do not expose this equipment to rain or moisture.
This unit is capable of producing high sound pressure levels. Continued exposure to high sound pressure levels can cause permanent hearing impairment or loss. User caution is advised and ear protection is recommended when playing at high volumes.
6. Only use attachments/accessories specified by the
manufacturer.
Installation:
7. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators,
heat registers, stoves, or other equipment (including
amplifiers) that produce heat.
9. Do not use this equipment near water.
10. Do not expose this equipment to dripping or splashing
and ensure that no objects filled with liquids, such as
vases, are placed on the equipment.
11. Use only with the cart, stand, tripod,
bracket, or table specified by the manufacturer, or sold with the equipment. When a
cart is used, use caution when moving the
cart/equipment combination to avoid injury from tip-over.
Care of Equipment:
12. Clean only with a dry cloth.
13. Do not permit objects or liquids of any kind to be
pushed, spilled and/or fall into the equipment through
enclosure openings.
Repair of Equipment:
14. Refer all servicing to qualified service personnel. Servicing is required when the equipment has been damaged in any way, liquid has been spilled or objects have
fallen into the equipment, the equipment has been exposed to rain or moisture, does not operate normally, or
has been dropped.
15. Do not attempt to service beyond that described in the
operating instructions. All other service should be referred to qualified service personnel.
16. When replacement parts are required, be sure the service technician has used replacement parts specified by
McIntosh or have the same characteristics as the original part. Unauthorized substitutions may result in fire,
electric shock, or other hazards.
17. Upon completion of any service or repairs to this product, ask the service technician to perform safety checks
to determine that the product is in proper operating
condition.
2
Thank You
Table of Contents
Your decision to own this McIntosh XR27 Loudspeaker
System ranks you at the very top among discriminating
music listeners. You now have “The Best.” The McIntosh
dedication to “Quality,” is assurance that you will receive
many years of musical enjoyment from this unit.
Please take a short time to read the information in this
manual. We want you to be as familiar as possible with all
the features and functions of your new McIntosh.
Please Take A Moment
The serial number, purchase date and McIntosh Dealer
name are important to you for possible insurance claim or
future service. The spaces below have been provided for
you to record that information:
Serial Number:
Purchase Date:
Dealer Name:
Technical Assistance
If at any time you have questions about your McIntosh
product, contact your McIntosh Dealer who is familiar
with your McIntosh equipment and any other brands that
may be part of your system. If you or your Dealer wish additional help concerning a suspected problem, you can receive technical assistance for all McIntosh products at:
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-1545
Fax: 607-723-3636
Customer Service
If it is determined that your McIntosh product is in need of
repair, you can return it to your Dealer. You can also return
it to the McIntosh Laboratory Service Department. For assistance on factory repair return procedure, contact the
McIntosh Service Department at:
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3515
Fax: 607-723-1917
Copyright 2003 by McIntosh Laboratory, Inc.
Safety Instructions ............................................................. 2
Thank You and Please Take a Moment ............................. 3
Technical Assistance and Customer Service ..................... 3
Table of Contents and Important Information ................... 3
Introduction ....................................................................... 4
Performance Features ........................................................ 5
Dimensions ........................................................................ 6
Installation ....................................................................... 10
How to Connect using a single amplifier ........................ 12
How to Connect using two amplifiers............................. 14
How to Connect using three amplifiers........................... 16
Specifications .................................................................. 18
Packing Instruction .......................................................... 19
Important Information
Caution: The XR27 weight is 84 pounds (38kg) and requires
two or more persons to safely handle.
1. Loudspeaker Cables of adequate size are important to ensure
that there will be no significant power loss or heating. Cable
size is specified in Gauge numbers or AWG (American Wire
Gauge). The smaller the Gauge number, the larger the wire
size:
If the Loudspeaker Cables are 25 feet (7.62m) or less, use at
least 18 Gauge (AWG) wire size or larger.
If the Loudspeaker Cables are 50 feet (38.1m) or less, use at
least 14 Gauge (AWG) wire size or larger.
If the Loudspeaker Cables are 100 feet (76.2m) or less, use at
least 12 Gauge (AWG) wire size or larger.
The Loudspeaker Connection Terminals can accept up to 12
Gauge (AWG) wire.
2. For additional connection information, refer to the owner’s
manual(s) for any component(s) connected to the XR27
Loudspeaker System.
3. The XR27 has built-in speaker protection in the form of four
automatic resetting solid-state devices as part of the
crossover networks. One protects the tweeters, one for the
midranges and two for the woofers. The characteristics of this
protection are that a certain amount of overdrive is allowed
but extended periods of overdrive will trigger protection. If an
obvious lack of high, mid or low frequencies is noticed, the
Loudspeaker Protection Device may have activated. The
protection devices will automatically reset when the volume
control is reduced significantly and kept low until the output
of the affected Loudspeaker Element returns to normal.
4. When the XR27 Loudspeaker System is driven by more than
one amplifier, the output levels of the different amplifiers
connected to the Loudspeaker System must be adjusted to
achieve a proper balance between the low, midrange and high
frequencies reproduced. This adjustment is best achieved
through the use of audio test equipment operated by a
qualified installer.
5. The XR27 is designed to be used with a Subwoofer, like a
McIntosh PS112, in order to hear the entire audible range of
sound.
3
Introduction
McIntosh Acoustic Engineers have refined the Loudspeaker System concept to provide superior sound quality
in a versatile enclosure with five different installation
methods.
The Low Frequency Section of the System consists of
four 8 inch Woofers. They have a large magnet assembly
and long cone excursions with very low levels of harmonic
distortion and frequency response down to 80Hz. Refer to
figure 1. The Woofer also incorporates McIntosh’s Pat-
The 6-1/2 inch Midrange Driver also incorporates
McIntosh’s Patented LD/HP
1
Magnetic Circuit Design with
shielding to greatly reduce any external magnetic field.
Refer to figures 1, 2 and 3. The low distortion of this
Midrange Driver results in the incredible smoothness and
clarity in the reproduction of the human voice. The five 1
inch soft dome Tweeters are inline and connected to produce a Bessel Function Array. Refer to figure 4. The indi-
Figure 1
ented LD/HP
1
Magnetic Circuit Design with shielding to
greatly reduce any external magnetic field. Extensive investigating and testing resulted in a new design concept which utilizes a pair of
aluminum shorting sleeves
LD/HP
Conventional
in the magnetic circuit. Refer to figure 2. The sleeves
virtually eliminate the negative influence of the fluctuating voice coil field on the
permanent magnet field.
This results in lower distor-
Figure 2
tion due to more linear magnetic flux in the voice coil gap.
Refer to figure 3. Additional benefits are less volume compression due to
improved heat
transfer through
the sleeves and a
cooler operating
voice coil. Both
measurements, as
well as critical
listening, reveal
ten times less distortion than previ-
Figure 3
ous designs.
Figure 4
vidual tweeter amplitudes and phase relationships are adjusted so the array acts as a high frequency point source.
One advantage of such an arrangement is a very smooth
and even acoustic polar response. This allows the listener
to move off axis without suffering a change in high frequency output. The use of multiple tweeters, combined
with a heat sink, also provides greatly increased power
handling at high frequencies.
The Crossover Networks used in the XR27 Loudspeaker System are designed to ensure an even frequency
response over the entire audible range. The Low Frequency Crossover Network is a Third Order design utilizing Capacitors and Inductors with high current capacity.
Refer to figure 5. Low Loss (DCR) Inductors in the Low
Figure 5
1
LD/HP Pat. No. 5,151,943
4
Frequency Network, are chosen not to exhibit any core
saturation even at high power levels. This prevents the ad-
dition of distortion to the music at low frequencies. The
Midrange and High Frequency Crossover Networks utilize
both Second and Third Order Crossover Designs. The Capacitors and Inductors used are of a high current capacity
design and include low loss (ESR) Polypropylene and
Mylar types. The Crossover Networks utilize self resetting
high current Poly-Switches to provide an extra measure of
protection.
The enclosure is an important part of the XR27 Loudspeaker System and consists of a massive extruded aluminum enclosure. Refer to figure 6. The front mounting
board is
made of
3/4 inch
thick
MDF that
houses
the four 8
inch
Woofers,
one 6-1/2 inch Midrange and the five one inch inline
Tweeter Drivers. Refer to figure 7. It has multiple front to
Figure 6
Introduction and Performance Features
Performance Features
Patented LD/HP Technology
•
The McIntosh Low Frequency and Midrange Loudspeaker
Elements feature the patented LD/HP Magnetic Circuit
Design. This design, when compared to conventional
Loudspeaker Elements, reduces distortion significantly. It
also increases power handling and efficiency.
Neodymium-Iron-Boron Alloy Magnets
•
The five one inch Dome Tweeters use Neodymium-IronBoron Alloy that has a high flux density per unit of volume
and helps to keep the weight to a minimum.
Bessel Function Array
•
The individual tweeter amplitudes and phase relationships
of the five tweeter array are adjusted to act as a high
frequency point source
Shielded Magnetic Field
•
The XR27 may be used in Home Theater Installations near
a television receiver or monitor without causing the
television image to degrade. McIntosh has designed
special shielding around the magnetic structure of the
XR27 Loudspeaker Elements to prevent interference.
Figure 7
back internal braces to form a dampened rigid Structure.
The XR27’s small footprint allows for a variety of different placements in a room.
High Power Handling
•
The Loudspeaker Elements and Crossover Components of
the XR27 are all chosen for use with powerful amplifiers
up to 1,200 watts.
Versatile Operation and Placement
•
In additional to the regular connections, the XR27 Loudspeaker System provides separate connections for Bi-Amplification hookups. The Crossover Network has provisions to ensure the best performance when the Loudspeaker System is mounted in a wall.
Gold Plated Input Connectors
•
The XR27 input connectors are gold plated for superior
corrosion resistance and high electrical conductivity.
5
XR27 Dimensions
The following dimensions can assist in determining the
best location for your XR27 Loudspeaker System.
Front View
"
-1/16
of the
XR27
13
33.18cm
"
-5/8
46
118.43cm
10"
25.4cm
-1/2
2
6.35cm
-1/2
6
16.51cm
"
-7/16
10
26.51cm
"
"
Rear View
of the
XR27
1
-11/16
4.29cm
2
5.40cm
-1/8
10
-1/8
"
25.72cm
"
-3/8
7
19
-5/8
49.85cm
"
-11/16
9
24.60cm
18.73cm
"
12"
30.48cm
7/8
"
"
7"
17.78cm
2.22cm
4
-7/8
"
12.38cm
"
13
-1/16
"
33.18cm
End Views
of the
XR27
9
-3/16
"
23.34cm
6
Installation
Dimensions and Installation
The XR27 Loudspeaker System requires two or more persons to safely handle during assembly and placement. Follow the instructions below for unpacking and assembly. It
is recommended that the Professionals at your McIntosh
Dealer, who are skilled in all aspects of installation and
operation, install the XR27 Loudspeaker System and any
associated audio equipment.
Unpacking the Loudspeaker System
1. Remove the banding material from the shipping carton. Refer to figure 8.
2. Lift off the top of the
shipping carton and set
it aside.
3. Lift up on the rear of the
Loudspeaker System,
near the foam packing
material at both ends.
Figure 8
Place the entire assembly (Loudspeaker System, Loudspeaker Grille, On-Wall mounting brackets and foam
packing material) next
to the bottom shipping
carton on a flat surface.
Refer to figure 9.
4. Release the Loudspeaker Grille from the
packing material by
Figure 9
opening the slit in the
packing material located on the top center. Remove the
Loudspeaker Grille from the protective shipping wrap
and set it aside.
5. In a similar manner, lift out the Loudspeaker System
and set it aside.
6. Replace the shipping carton top onto the shipping carton bottom. Take the two center pieces of the just removed packing material and lay it down flat onto the
top of the shipping carton.
7. Carefully remove the protective shipping bag(s) from
the Loudspeaker System so as not to mar the finish or
damage the Loudspeaker System Drivers.
8. Place the Loudspeaker System, with the front facing
down, on top of the packing material located on top of
the shipping carton. Refer to figure 10.
Packing material
Installation Methods
The XR27 may be installed using one of five installation
methods listed below:
1. Placing the XR27 horizontally on a flat surface using
the attached Stabilizer Bar.
2. Mounting the XR27 vertically on a wall using the supplied Brackets and Hardware.
3. Mounting the XR27 horizontally on a wall using the
supplied Bracket and Hardware.
4. Mounting the XR27 vertically or horizontally In-Wall
using the optional McIntosh CK27 which includes
Brackets, Hardware and a special Loudspeaker Grille.
5. Using the optional McIntosh ST27 Vertical Mount
Floor Stand.
Proceed to the desired Installation Method that follows.
Installation using the Stabilizer Bar
1. Attach the rubber bumpers to the bottom long edge of
the XR27 Loudspeaker System and Stabilizer Bar. Refer to figure 11.
2. Loosen, but do not remove, the four screws securing
Stabilizer Bar Screws
Stabilizer Bar
Large Rubber Bumpers
Small Rubber Bumpers
Figure 11
the Stabilizer Bar to the back of the XR27 Loudspeaker System. Refer to figure 11.
3. Reposition the Stabilizer Bar with the widest side even
with the long side edge of the XR27 extruded aluminum enclosure. Refer to figure
12.
4. Tighten the four screws securing the Stabilizer Bar to keep it in place, but not enough
to prevent changing the angle of the XR27 in
the following steps.
5. The vertical angle of the XR27 may be
changed ±5.5 degrees from perpendicular,
Figure 12
allowing the sound to be directed
upwards or downwards to accommodate the seating arrangement in
the room. Refer to figure 13. This
can be accomplished by temporarily loosening the four screws
and moving the Stabilizer Bar up or
Figure 13
Figure 10
7
down. When the desired angle is achieved tighten the
four screws.
6. Locate the Loudspeaker Grille and align the fastening
pins to the Grommets (there are four pins on each side)
on the front of the XR27. Carefully push down to secure the Grille to the Loudspeaker until it is firmly
seated.
Vertical On-Wall Installation
The supplied On-Wall Mounting Brackets allow for two
different mounting positions of the XR27 Loudspeaker
relative to the wall. The first position is with the Loudspeaker close to and parallel with the wall. The second position places the Loudspeaker further away from the wall
and allows for horizontal rotation of ± 30 Degrees.
1. Remove the four screws securing the Stabilizer Bar to
Stabilizer Bar Screws
Stabilizer Bar
Figure 14
the back of the XR27 Loudspeaker System. Refer to
figure 14.
Note: Save the just removed Stabilizer Bar and screws for
possible future use.
2. Using the supplied Allen Wrench and hardware, install
four Allen Head 10/32 - 3/4 inch Screws into the openings vacated by the removal of the Stabilizer Bar.
3. Decide on which mounting
Remove this Screw
position will be used for
the Loudspeaker and remove one of the center
screws from both ends of
the Loudspeaker. Refer to
figure 15.
Note: Save the just removed
screws for possible
future use.
Figure 15
4. Attach the Nylon Pivot Pin to one of the L Mounting
Brackets using the short Pivot Pin Screw and Lock
Washer. Refer to figures 16 and 17 for the correct
opening location.
5. Attach the other L Mounting Bracket to the Top of the
Loudspeaker using the long Pivot Screw and Steel
Bushing into the correct opening, based on the desired
mounting position.
6. Determine the Loudspeaker Mounting Location on the
wall, making sure that the Mounting Brackets will be
anchored to the
studs located inside the wall.
7. Referring to figures 16 and 17 install the Mounting
Sleeve on the wall
(orient with opening at the top) us-
Top and Bottom L Mounting Bracket
Opening for screw, allowing horizontal rotation of
Column
Opening for screw,
allowing close to
wall mounting
Opening for
Locking Screw
Figure 16
ing the supplied
Mounting Screws (Phillips Head 1/4 x 1-3/4 inch).
8. Referring to
figure 17,
measure down
from the just
mounted L
Bracket and
install the Bottom L Bracket
together with
the Shim
Plate, using
the supplied
Mounting
Screws
(Phillips Head
1/4 x 1-3/4
inch).
9. With two persons, orient
the Loudspeaker End
with the Top L
Bracket above
the Mounting
Sleeve and
carefully line
up the bracket
with the
sleeve. Lower
Figure 17
the Loudspeaker onto the Nylon Pivot Point on the Bottom L
Bracket while at the same time the Top L Bracket is
inserted into the Mounting Sleeve.
10. Install the Locking Screw together with the Flat
Washer into the opening on the Top L Bracket to secure the Loudspeaker.
11. Locate the Loudspeaker Grille and align the fastening
pins to the Grommets on the front of the XR27 (there
8
Installation, con’t
are four pins on each side). Carefully push down to
secure the Grille to the Loudspeaker until it is firmly
seated.
Horizontal On-Wall Installation
The supplied Horizontal On-Wall Mounting Bracket allows for mounting the XR27 Loudspeaker onto a wall. The
Loudspeaker may be rotated ±15 Degrees allowing for
placement either above or below a TV/Monitor/Screen.
The XR27 Loudspeakers’s Smooth Frequency Response
may be altered by large object(s) located in sound waves
path or by locating the column too close to a floor or ceiling. There should be an unobstructed area in front of the
Loudspeaker of at least 15 degrees either side from the
center axis for the best performance.
1. Remove the four screws securing the Stabilizer Bar to
the back of the XR27 Loud-
Remove these Screws
speaker System. Refer to figure 14.
Note: Save the just removed
Stabilizer Bar and screws
for possible future use.
2. Using the supplied Allen
Wrench and hardware, install
four Allen Head 10/32 - 3/4
inch Screws into the openings
Figure 18
vacated by the removal of the Stabilizer Bar.
3. Remove both of the center screws from both ends of
the Loudspeaker.
Refer to figure 18.
Note: Save the just
removed screws for
possible future use.
4. Attach the Wall
Hanger Bracket to
the Loudspeaker using the supplied
mounting screws
(1/4 x 1-1/2 inch
Figure 19
Allen Head) and
lock washers, making sure the large rectangular opening on the bracket lines up with the Loudspeaker
hookup terminal connections. Refer to figure 19.
Note: The Loudspeaker may be mounted closer and parallel
to the wall by using the two additional openings on
the Wall Hanger Bracket instead of the openings
allowing rotation of the Loudspeaker.
5. Use a suitable wall stud finder to verify a proper
mounting location for the Loudspeaker on the wall.
6. Attach the Wall Bracket to the wall studs using the supplied mounting screws (8 x 2-1/2 inch Phillips Flat
Head) making sure the large
rectangular opening on the
bracket is located on the left
side as you face it. Refer to
figure 20.
Note: It is important to
anchor the Wall
Bracket to at
least three wall
studs, using
three mounting
screws per stud.
The large
rectangular
opening on the
left side of the
Wall Bracket
allows for the
optional routing of the
Loudspeaker Hookup Wire inside
the wall.
Figure 20
7. Refer to pages 11 through 13 in this
Manual and make the necessary connections to the rear of the Loudspeaker.
8. With two persons supporting the
XR27 Loudspeaker, position it with
the rear of the Wall Hanger almost
touching the wall and above the
mounted Wall Bracket. Slowly lower
the Loudspeaker down and align the
top bent over portion of the Wall
Hanger with the top of the mounted
Figure 21
Wall Bracket. Refer to figures 21 and
22.
9. Locate the Loudspeaker Grille and
align the fastening pins to the Grommets on the front of the XR27 (there
are four pins on each side). Carefully
push down to secure the Grille to the
Loudspeaker until it is firmly seated.
In-Wall Installation
1. Remove the four screws securing the
Figure 22
Stabilizer Bar to the back of the
XR27 Loudspeaker System. Refer to figure 14.
2. Using the supplied Allen Wrench and hardware, install
four screws (10/32 x 3/4 inch Allen Head) into the
openings vacated by the removal of the Stabilizer Bar.
3. Proceed to the CK27 Installation Guide to install the
XR27 into the wall.
9
Installation, con’t
Vertical Mount Floor Stand Installation
1. Remove the four screws securing the Stabilizer Bar to
the back of the XR27 Loudspeaker System. Refer to
figure 14 on page 8.
2. Using the supplied Allen Wrench and hardware, install
four screws (10/32 x 3/4 inch Allen Head) into the
openings vacated by the removal of the Stabilizer Bar.
3. Proceed to the ST27 Installation Guide to install the
XR27 into the Vertical Mount Floor Stand.
Room Placement
Loudspeaker placement in a room can greatly affect
performance. The XR27 Loudspeaker System is designed
for both Music and Home Theater Systems. The optimal
method for selecting speaker locations includes the use of
a real time spectrum analyzer operated by an experienced
system installer. An uncompromising installation would
take into consideration the floor, wall and ceiling
coverings, the type and placement of furniture and can
even include the architectural design of the room and its
construction materials. In those instances where placement
in the room is fixed, an environmental equalizer may be
needed to restore proper musical balance.
Placement near a wall, corner, floor, ceiling or any intersecting surfaces will reinforce some bass frequencies.
Which bass frequencies are boosted by placement in a particular location is dependent on the dimensions of the
room. Test the various Loudspeaker locations by playing
music with continuous bass, setting up the speakers and
listening to them from the main listening spot. Move the
Loudspeakers to an alternate location and repeat the listening, paying attention to how the bass qualities and response levels change. Do not assume the loudest bass is
best; rather listen for booming (a lack of articulation), as
well as a balance over the whole spectrum, to assure the
bass will not drown out the other parts of the music. Experiment with various Loudspeaker positions to determine
the best sounding location.
Room Placement
Figure 18
Locating Loudspeakers for use in a Music System
When used in a Music System the distance between the
Loudspeakers and the listener to the Loudspeakers should
form an isosceles triangle. If the speakers are too far apart
relative to the listener, some imaging can be lost. Refer to
figure 19.
Locating Loudspeakers for use in Home Theater
In a Home Theater application, the placement of Left and
Right Front Loudspeakers can be limited by such
considerations as the size and location of the video
monitor. The locating suggestions in the “for use in a
Music System” section below can still be helpful as a
starting place. Refer to figure 18.
10
Figure 19
How to Connect using a single Amplifier
How to Prepare Hookup Cables
The McIntosh XR27 Loudspeaker System utilizes binding
posts for speaker wire connections. Prepare the Loudspeaker Hookup Cables that attach to the Power Amplifier
Output Terminals:
Bare wire cable ends:
Carefully remove sufficient insulation from the cable
ends, refer to figures 20, 21 & 22. If the cable is
stranded, carefully twist the
strands together as
tightly as possible.
Note: If desired, the twisted ends can be tinned with
solder to keep the strands together and/or attach a
spade lug.
Spade lug or prepared wire connection:
Insert the spade lug connector or prepared section of
the cable end into the terminal side access hole, and
tighten the terminal cap until the cable is firmly
clamped into the terminal so the wires cannot slip out.
Refer to figures 23, 24 & 25.
Connections using a single Amplifier
1. Connect a Loudspeaker cable from the Negative (-)
Binding Post of the Amplifier to the XR27 LOW
COMmon (-) Binding Post.
2. Connect a Loudspeaker cable from the Positive (+)
Binding Post of the Amplifier to the XR27 LOW 4S (+)
Binding Post.
Note: The LOW and MID/HIGH COMmon (-) Binding Posts
must have a jumper installed between them. Likewise
the LOW and MID/HIGH 4S (+) Binding Posts must
also have a jumper installed between them. If the XR27
Loudspeaker is installed into wall, use the IN-WALL
Binding Posts instead of the LOW Binding Posts.
3. Tighten all of the Loudspeaker and Amplifier Binding
Posts.
McIntosh Single Channel Amplifier
11
How to Prepare Hookup Cables
The McIntosh XR27 Loudspeaker System utilizes binding
posts for speaker wire connections. Prepare the Loudspeaker Hookup Cables that attach to the Power Amplifier
Output Terminals:
Bare wire cable ends:
Carefully remove sufficient insulation from the cable
ends, refer to figures 20, 21 & 22. If the cable is
stranded, carefully twist the
strands together as
tightly as possible.
Note: If desired, the twisted ends can be tinned with
solder to keep the strands together and/or attach a
spade lug.
Spade lug or prepared wire connection:
Insert the spade lug connector or prepared section of
the cable end into the terminal side access hole, and
tighten the terminal cap until the cable is firmly
clamped into the terminal so the wires cannot slip out.
Refer to figures 23, 24 & 25.
McIntosh Single Channel Amplifier Number Two
How to Connect using two Amplifiers
1. Remove the jumpers between the LOW and MID/HIGH
Binding Posts and save them for possible future use.
2. Connect a Loudspeaker cable from the Negative (-)
Binding Post of the Amplifier Number One to the XR27
LOW COMmon (-) Binding Post.
Note: If the XR27 Loudspeaker is installed into wall, use the
IN-WALL Binding Posts instead of the LOW Binding
Posts.
3. Connect a Loudspeaker cable from the Positive (+)
Binding Post of the Amplifier Number One to the XR27
LOW 4S (+) Binding Post.
4. Connect a Loudspeaker cable from the Negative (-)
Binding Post of the Amplifier Number Two to the
XR27 MID/HIGH COMmon (-) Binding Post.
5. Connect a Loudspeaker cable from the Positive (+)
Binding Post of the Amplifier Number Two to the
XR27 MID/HIGH 4S (+) Binding Post.
6. Tighten all of the Loudspeaker and Amplifier Binding
Posts.
McIntosh Single Channel Amplifier Number One
12
How to Connect using two Amplifiers
13
Specifications
System Driver Complement
Four 8 inch Woofers
One 6.5 inch Midrange
Five 1 inch Dome Tweeters
Impedance
4 ohms Nominal
Frequency Response
80Hz - 20kHz
Sensitivity
89dB (2.8V/1m)
Crossover Frequencies
275Hz
2,800Hz
Specifications
Power Handling
1200 Watts Maximum
Overall Dimensions
13-1/16 inches (33.18cm) Height
46-5/8 inches (118.43cm) Width
5-3/4 inches (14.61cm) Depth
Finish
Black Ash, Natural Cherry, Red Cherry
Weight
84 pounds (38 kg) net, 105 pounds (48 kg) in shipping
carton
14
Packing Instructions
Packing Instructions
In the event it is necessary to repack the equipment for
shipment, the equipment must be packed exactly as received. Failure to do so will result in shipping damage.
Use the original shipping carton and interior parts only
if they are in good serviceable condition. If a shipping carton or any of the interior part(s) are needed, please call or
write Customer Service Department of McIntosh Laboratory.
High Frequency Section Column
Quantity Part Number Description
1 034221 Top shipping carton
1 034222 Bottom shipping carton
2 034205 Foam end cap
2 034206 Foam center cap
15
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, NY 13903
The continuous improvement of its products is the
policy of McIntosh Laboratory Incorporated who
reserve the right to improve design without notice.
Printed in the U.S.A.
McIntosh Part No. 04085501
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